Why is it der Bregenzer?

Bregenzer ends in -er, and most nouns ending in -er are masculine: in a German dictionary, 86% of them take der.

All nouns ending in -er
Sense 1
der

Meaning

[1] Residents of Bregencande someone who lives in Bregenz

[1] Bewohner von Bregenz; jemand, der in Bregenz lebt

Examples

[1] Sepp is a native of Bregenz

[1] Sepp ist ein gebürtiger Bregenzer.

[1] "One of the two women lost their child after the Bregenzer kicked her in her stomach"

[1] „Eine der beiden Frauen verlor ihr Kind, nachdem der Bregenzer sie in den Bauch getreten hat.“

Declension

1 Singular Plural
Nominativ der Bregenzer die Bregenzer
Genitiv des Bregenzers der Bregenzer
Dativ dem Bregenzer den Bregenzern
Akkusativ den Bregenzer die Bregenzer

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary